(1) This is the sound a woman makes while being happily penetrated by a penis, masturbation object, or three fingers.
(2) This is also the occasional noise a man makes while penetrating ANYTHING. It is extremely unattractive for a man to groan and/or make noise while penetrating a woman.

She was laying there in bed. Spread eagle. Her big pink lips opened as wide as she could get them. Om man, was he turned on. She was wearing nothing but a big pink boa and bright pink lipstick, the kind that wouldn't come off when she gave him some oral. He stripped off his pants right away. He came to the bed and dove fave first into her vagina. Licking, teasing, and biting. "ohhhh ya! oh ya!" she said bucking.

As soon as he had enough cum in his mouth, he started moving up to her mouth. kissing her rougher he became harder and harder. She scremaed "yess! YESSS!!!! DO ME HARD!!!!" So he did. He penetrated her. He shoved himself in and out. In and out. "Yes! Oh Yes!" She screamed as he shoved his entire fist into her vagina.

The Urban Dictionary T-Shirt

noun: a male with extraordinary talent. particularly in attracting supermodels and women regarded as total wendys. also, an urban legend about a man blessed with the ability to send women into uncontrollable fits of pleasure by dancing with them.